All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Job 181-90.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Nitric Acid

Conc.Wt.%

50°F

75°F

100°F

125°F

150°F

175°F

200°F

225°F

Boiling

10°C

24°C

38°C

52°C

66°C

79°C

93°C

107°C

10

-

-

-

-

-

-

-

-

<0.01

20

-

-

-

-

-

-

-

-

<0.01

30

-

-

-

-

-

-

-

-

0.01

40

-

-

-

-

-

-

-

-

0.03

50

-

-

-

-

-

-

-

-

0.07

60

-

-

-

-

-

-

0.03

-

0.12

65

-

-

-

-

-

-

0.04

-

0.15

70

-

-

-

-

-

-

0.06

-

0.18

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Job 182-90.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Phosphoric Acid

Conc.Wt.%

125°F

150°F

175°F

200°F

225°F

250°F

Boiling

52°C

66°C

79°C

93°C

107°C

121°C

10

-

-

-

-

-

<0.01

20

-

-

-

-

-

0.01

30

-

-

-

-

-

0.01

40

-

-

-

-

-

0.03

50

-

-

-

<0.01

-

-

0.14

60

-

-

-

0.01

-

0.01

0.25

70

-

-

-

0.01

0.01

0.02

0.46

80

-

-

-

0.01

0.07

0.55

10.95

85

-

-

-

0.01

0.07

0.57

30.58

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Job 183-90.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.

Sulfuric Acid

Conc.Wt.%

75°F

100°F

125°F

150°F

175°F

200°F

225°F

250°F

275°F

300°F

350°F

Boiling

24°C

38°C

52°C

66°C

79°C

93°C

107°C

121°C

135°C

149°C

177°C

1

-

-

-

-

-

-

-

-

-

-

-

0.13

2

-

-

-

-

-

<0.01

-

-

-

-

-

0.27

3

-

-

-

-

-

-

-

-

-

-

-

-

4

-

-

-

-

-

-

-

-

-

-

-

-

5

-

-

-

<0.01

-

0.01

-

-

-

-

-

1.26

10

-

-

-

-

-

0.43

-

-

-

-

-

1.92

20

-

-

-

<0.01

0.01

1.83

-

-

-

-

-

4.48

30

-

-

-

<0.01

1.36

3.58

-

-

-

-

-

10.54

40

-

<0.01

<0.01

0.29

2.25

-

-

-

-

-

-

20.94

50

-

<0.01

-

0.96

-

-

-

-

-

-

-

-

60

-

<0.01

<0.01

1.48

-

-

-

-

-

-

-

-

65

-

-

0.63

-

-

-

-

-

-

-

-

-

70

-

<0.01

0.55

-

-

-

-

-

-

-

-

-

80

-

<0.01

1.02

1.64

-

-

-

-

-

-

-

-

85

-

0.03

-

-

-

-

-

-

-

-

-

-

90

<0.01

0.26

1.68

-

-

-

-

-

-

-

-

-

96

<0.01

0.21

1.76

2.24

-

-

-

-

-

-

-

-

All corrosion rates are in millimeters per year (mm/y); to convert to mils (thousandths of an inch) per year, divide by 0.0254.
Data are from Corrosion Laboratory Jobs 159-90 and 8-91.
All tests were performed in reagent grade acids under laboratory conditions; field tests are encouraged prior to industrial use.